The average Brit spends almost 15 hours a day on their bum - including nearly two-and-a-half hours parked in front of the telly.

We sit down for more than four hours at work and almost two-and-a-half hours in front of home computers, according to a survey.

The study of 3,000 people for WeightWatchers UK found driving and travel on public transport accounts for a further one hour 33 minutes of the daily routine.

Meal times take up 33 minutes, with 54 minutes dedicated to computer games and an hour and 10 minutes spent tucked up in bed with a book or magazine. Just over half of those quizzed admitted their only exercise was walking to and from their cars.

Four in 10 said they worked too much to go to the gym or exercise, while the same number claimed they were too exhausted to pack in any more activity.

Weight Watchers dietician Zoe Hellman said: "Mostly, this lack of exercise and movement is down to habit.

"People become so used to relaxing in front of the TV at the end of a busy day they choose that over a short jog or gym session.

"Exercise has an important role in helping people to lose weight and for keeping your weight in check." The top three exercise choices were walking (43%), jogging (20%) and gym (16%) - although 17% claimed they felt too fat to do anything.

Calories We still lose them per hour while sitting - including 80 when eating, 55 while watching TV or reading and 100 when writing or typing.